Soil temperature in Montreal, Quebec
Soil temperature
21.4°C71°F
at 6cm — germination depth
Cooling over the next 11 days.
Seeding conditions are open — soil is 21.4°C at 6cm and holding above 12.5°C.
Most cool-season lawns in the northern US and Canada are bluegrass, tall fescue, or a mix of the two. We assume that, and use12.5°C as the seeding threshold.
I know what grass I have
The differences are small. Ryegrass is the quickest off the mark; bluegrass is the slowest and wants the warmest soil. Everything else sits between.
| Species | Soil temp | Days |
|---|---|---|
| Perennial ryegrass | 8°C | 5–10 |
| Red / chewings fescue | 8–10°C | 10–14 |
| Tall fescuelikely yours | 10–12°C | 10–14 |
| Browntop bentColonial bentgrass | 10–12°C | 14–21 |
| Smooth-stalked meadow grassKentucky bluegrasslikely yours | 12–13°C | 14–28 |
Soil temperature at 6cm in Montreal, Quebec is currently 21.4°C, and falling about 19.4°C over the next 11 days. That depth matters because it is where grass seed sits and where roots start working, and it lags air temperature by days — which is why a warm afternoon here tells you very little on its own.
Lawns in this area are typically Kentucky bluegrass with tall fescue, the usual mix for cool-season lawns at this latitude. That blend needs the soil to hold above 12.5°C before seed germinates reliably. Seeding conditions are open — soil is 21.4°C at 6cm and holding above 12.5°C.
7 of the next 10 days are good mowing days. The best weekend slot right now is Sunday 10am–8pm, on the basis that ground soft in places — 39mm rain over the last week.
The next recommended window in Montreal opens at 8am on Wednesday 2 September, because anything earlier is the hour your neighbours will remember. Underfoot, the ground reads as soft in places after 2mm rain over the last week.
The next 10 days
Column height is how mowable the day is; the lighter band is the best stretch within it. The line is soil temperature at 6cm. It crosses the seeding threshold inside this forecast.
12.5°C — seeding
Soil at 6cm 20.1°C cooling to 0.0°C
Tuesday 1 September: Not worth it. No — nothing quite good enough today.
Tuesday 1 SeptemberConfident
No — nothing quite good enough today.
- Good:Grass wetness
- Grass dryno rain since Sunday
- Good:Ground firmness
- Ground soft in places2mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.91
- Good:Temperature
- Temperature17°C
- Good:Wind
- Wind light11 km/h
Limiting factor:none
Wednesday 2 September: Good. 8am–8pm — no rain since Sunday, ground soft in places
Wednesday 2 September · 8am–8pmConfident
8am–8pm — no rain since Sunday, ground soft in places
- Good:Grass wetness
- Grass dryno rain since Sunday
- Good:Ground firmness
- Ground soft in places2mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.94
- Good:Temperature
- Temperature15°C
- Good:Wind
- Wind light9 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:none
Thursday 3 September: Good. No — ground waterlogged.
Thursday 3 SeptemberConfident
No — ground waterlogged.
- Marginal:Grass wetness
- Grass dryrain earlier today
- Poor:Ground firmness
- Ground soft2mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.98
- Good:Temperature
- Temperature16°C
- Good:Wind
- Wind light9 km/h
Limiting factor:ground firmness
Friday 4 September: Good. 8am–11am — ground soft — 37mm rain over the last week
Friday 4 September · 8am–11amConfident
8am–11am — ground soft — 37mm rain over the last week
- Good:Grass wetness
- Grass dryrain earlier today
- Poor:Ground firmness
- Ground soft37mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.91
- Good:Temperature
- Temperature15°C
- Good:Wind
- Wind light7 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:ground firmness
Saturday 5 September: Good. 8am–1pm — ground soft — 39mm rain over the last week
Saturday 5 September · 8am–1pmReasonably confident
8am–1pm — ground soft — 39mm rain over the last week
- Good:Grass wetness
- Grass dryrain earlier today
- Marginal:Ground firmness
- Ground soft39mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.74
- Good:Temperature
- Temperature15°C
- Good:Wind
- Wind light8 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:ground firmness
Sunday 6 September: Good. 10am–8pm — ground soft in places — 39mm rain over the last week
Sunday 6 September · 10am–8pmReasonably confident
10am–8pm — ground soft in places — 39mm rain over the last week
- Good:Grass wetness
- Grass dryrain earlier today
- Marginal:Ground firmness
- Ground soft in places39mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.77
- Good:Temperature
- Temperature11°C
- Good:Wind
- Wind light3 km/h
- Sociable hours
- Fine by the neighboursstarts when it stops being antisocial
Limiting factor:ground firmness
Monday 7 September: Good. 8am–8pm — grass dry — no rain since Saturday
Monday 7 September · 8am–8pmReasonably confident
8am–8pm — grass dry — no rain since Saturday
- Good:Grass wetness
- Grass dryno rain since Saturday
- Marginal:Ground firmness
- Ground soft in places39mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.89
- Good:Temperature
- Temperature14°C
- Good:Wind
- Wind light3 km/h
- Sociable hours
- A bit early or late, but finestarts once the dew has burnt off
Limiting factor:grass wetness
Tuesday 8 September: Good. 2pm–8pm — grass dry — dried off since a shower 4 hours ago
Tuesday 8 September · 2pm–8pmReasonably confident
2pm–8pm — grass dry — dried off since a shower 4 hours ago
- Poor:Grass wetness
- Grass drydried off since a shower 4 hours ago
- Marginal:Ground firmness
- Ground soft in places39mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.68
- Good:Temperature
- Temperature14°C
- Good:Wind
- Wind light12 km/h
- Sociable hours
- Fine by the neighboursstarts once the dew has burnt off
Limiting factor:grass wetness
Wednesday 9 September: Not worth it. No — ground frozen.
Wednesday 9 SeptemberLow confidence this far out
No — ground frozen.
- Good:Grass wetness
- Grass dryrain earlier today
- Good:Ground firmness
- Ground firm45mm rain over the last week
- Marginal:Growth
- Growing slowlygrowth potential 0.25
- Good:Temperature
- Temperature11°C
- Good:Wind
- Wind light9 km/h
Limiting factor:growth
Thursday 10 September: Not worth it. No — ground frozen.
Thursday 10 SeptemberLow confidence this far out
No — ground frozen.
- Poor:Grass wetness
- Grass wetraining now
- Good:Ground firmness
- Ground soft in places45mm rain over the last week
- Poor:Growth
- Barely growinggrowth potential 0.16
- Good:Temperature
- Temperature11°C
- Good:Wind
- Wind light17 km/h
Limiting factor:grass wetness
Nearby
Your own postcode
These are town-centre figures. Yours will differ a little.